Yes. We have spend lots of development time optimising VR Sketch to work with files of all sizes. If
your files are super large your hardware (normally your GPU) may struggle. We have also found that
keeping your geometry inside groups and components helps speed things up.

Yes. VR Sketch supports multiple people in VR working on the same file using our
Collaboration feature.
To collaborate with someone, all you need to do is upload the file and send them the link
then they can all join the same shared SketchUp file and work together.

VR Sketch also allows one person to be inside VR while the other is at the computer. Both people will be able to see
each others actions is real time.